<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <div id="app">
    <cpn></cpn>
    </div>

    <template id="cpn">
        <div>
            <h2>cpn组件</h2>
            <ccpn></ccpn>
        </div>
        
    </template>

    <template id="ccpn">
        <div>
            <h2>我是子组件</h2>
            <button @click="btnClick">按钮</button>
        </div>
    </template>
    <script src="../js/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                message:'你好呀！'
            },
            components:{
                cpn:{
                    template:"#cpn",
                    data(){
                        return{
                            name:"444"
                        }
                    },
                    components:{
                        ccpn:{
                            template:'#ccpn',
                            methods:{
                                btnClick(){
                            // 访问父组件$parent
                            console.log(this.$parent);
                            console.log(this.$parent.name);  //你好呀


                            // 访问根组件
                            console.log(this.$root.message);

                        }
                            }
                        }
                    }
                    
                }
            }
        })
    </script>
</body>
</html>